/* roulang page: index */
:root {
      --ink: #1C1F1D;
      --amber: #C45C26;
      --amber-dark: #A44A1C;
      --plaster: #F3F0EA;
      --mist: #E7EBE6;
      --moss: #3E6A4F;
      --dark: #121314;
      --warm: #F7F4EE;
      --text: #2A2D2B;
      --muted: #6B716C;
      --line: #D8D4CB;
      --champagne: rgba(232, 213, 186, .18);
      --radius: 4px;
      --shadow: 0 8px 24px rgba(28, 31, 29, .06);
      --header: 118px;
      --serif: "Noto Serif SC", "Songti SC", serif;
      --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--sans);
      font-size: 16px;
      line-height: 1.8;
      color: var(--text);
      background: var(--plaster);
      overflow-x: hidden;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; border: 0; background: none; }
    ul { list-style: none; }
    .container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
    .skip {
      position: absolute; left: -999px; top: 8px;
      background: var(--amber); color: #fff; padding: 8px 12px; z-index: 80;
    }
    .skip:focus { left: 8px; }
    .site-header {
      position: sticky; top: 0; z-index: 50;
      background: var(--plaster);
      border-bottom: 1px solid var(--line);
      transition: box-shadow .25s ease;
    }
    .site-header.is-slim { box-shadow: var(--shadow); }
    .tool-bar {
      display: flex; align-items: center; justify-content: space-between;
      gap: 16px; min-height: 38px;
      background: var(--ink); color: #EDE8DF;
      padding: 0 20px; font-size: 12px; letter-spacing: .02em;
    }
    .tool-left, .tool-right { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
    .tool-bar a { color: #EDE8DF; }
    .tool-bar a:hover { color: #F3C7A8; }
    .tool-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--moss); display: inline-block; }
    .main-bar {
      display: flex; align-items: center; justify-content: space-between;
      gap: 20px; min-height: 80px; padding: 0 20px;
      background: rgba(243, 240, 234, .96); backdrop-filter: blur(10px);
      transition: min-height .25s ease;
    }
    .site-header.is-slim .main-bar { min-height: 62px; }
    .logo {
      display: flex; align-items: center; gap: 10px; min-width: 168px;
    }
    .logo-mark {
      width: 34px; height: 34px; border: 1px solid var(--ink);
      display: grid; place-items: center; color: var(--amber);
      font-family: var(--serif); font-weight: 700; font-size: 15px;
    }
    .logo-text { display: flex; flex-direction: column; line-height: 1.15; }
    .logo-text strong { font-family: var(--serif); font-size: 16px; color: var(--ink); font-weight: 700; }
    .logo-text span { font-size: 11px; color: var(--muted); letter-spacing: .18em; }
    .nav-links { display: flex; align-items: center; gap: 4px; }
    .nav-links a {
      position: relative; padding: 10px 11px; font-size: 14px; color: var(--ink);
    }
    .nav-links a::after {
      content: ""; position: absolute; left: 11px; right: 11px; bottom: 6px;
      height: 1px; background: var(--amber); transform: scaleX(0);
      transform-origin: left; transition: transform .28s ease;
    }
    .nav-links a:hover::after, .nav-links a.is-active::after { transform: scaleX(1); }
    .nav-cta, .btn {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 44px; padding: 0 18px; border-radius: var(--radius);
      font-size: 14px; letter-spacing: .04em; transition: .2s ease;
    }
    .btn-primary, .nav-cta {
      background: var(--amber); color: #fff;
    }
    .btn-primary:hover, .nav-cta:hover { background: var(--amber-dark); }
    .btn-ghost {
      border: 1px solid var(--ink); color: var(--ink); background: transparent;
    }
    .btn-ghost:hover { background: var(--ink); color: #fff; }
    .btn:focus-visible, .nav-cta:focus-visible, .nav-links a:focus-visible, .tool-bar a:focus-visible, .hamburger:focus-visible, .faq-q:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--amber); outline-offset: 2px;
    }
    .hamburger {
      display: none; width: 44px; height: 44px; position: relative;
    }
    .hamburger span, .hamburger::before, .hamburger::after {
      content: ""; position: absolute; left: 11px; right: 11px; height: 1.5px; background: var(--ink);
    }
    .hamburger span { top: 21px; }
    .hamburger::before { top: 14px; }
    .hamburger::after { top: 28px; }
    .drawer {
      display: none; position: fixed; inset: 0; background: rgba(18,19,20,.46); z-index: 60;
    }
    .drawer.is-open { display: block; }
    .drawer-panel {
      position: absolute; right: 0; top: 0; bottom: 0; width: min(86vw, 360px);
      background: var(--plaster); padding: 28px 22px; overflow: auto;
    }
    .drawer-panel a { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); min-height: 44px; }
    .hero { position: relative; min-height: 92vh; color: #F7F1E8; overflow: hidden; }
    .slides, .slide { position: absolute; inset: 0; }
    .slide { opacity: 0; transition: opacity .8s ease; }
    .slide.is-on { opacity: 1; z-index: 1; }
    .slide img {
      width: 100%; height: 100%; object-fit: cover;
      animation: ken 18s ease-in-out infinite alternate;
    }
    .slide::after {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(90deg, rgba(18,19,20,.78) 0%, rgba(18,19,20,.42) 52%, rgba(18,19,20,.22) 100%);
    }
    @keyframes ken { from { transform: scale(1); } to { transform: scale(1.08); } }
    .hero-grid {
      position: relative; z-index: 2;
      display: grid; grid-template-columns: 1.15fr .85fr; gap: 36px;
      align-items: center; min-height: 92vh; padding: 48px 0 64px;
    }
    .kicker {
      display: inline-flex; align-items: center; gap: 8px;
      font-size: 12px; letter-spacing: .22em; color: #E8D5BA; margin-bottom: 18px;
    }
    .hero h1 {
      font-family: var(--serif); font-size: clamp(32px, 5.4vw, 68px);
      line-height: 1.12; letter-spacing: -.04em; font-weight: 600; max-width: 11em;
    }
    .hero-lead {
      margin-top: .8em; max-width: 38em; color: #E8E2D8; font-size: 15px;
    }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
    .hero-panel {
      border: 1px solid var(--champagne); background: rgba(18,19,20,.42);
      padding: 22px; backdrop-filter: blur(6px);
    }
    .ring-wrap { display: grid; grid-template-columns: 140px 1fr; gap: 16px; align-items: center; }
    .ring { width: 132px; height: 132px; }
    .ring circle { fill: none; stroke-width: 8; }
    .ring .track { stroke: rgba(232,213,186,.16); }
    .ring .value { stroke: var(--amber); stroke-linecap: butt; transform: rotate(-90deg); transform-origin: 50% 50%; }
    .ring-num { font-family: var(--serif); font-size: 28px; }
    .ring-cap { font-size: 12px; color: #C9C2B6; }
    .tiers { display: grid; gap: 8px; margin-top: 16px; }
    .tier {
      display: grid; grid-template-columns: 72px 1fr auto; gap: 10px; align-items: center;
      border: 1px solid var(--champagne); padding: 10px 12px; font-size: 13px;
    }
    .tier b { color: #F3C7A8; font-weight: 500; }
    .dots { display: flex; gap: 8px; margin-top: 18px; }
    .dots button {
      width: 28px; height: 4px; background: rgba(247,241,232,.28);
    }
    .dots button.is-on { background: var(--amber); }
    section { padding: 88px 0; }
    .sec-plaster { background: var(--plaster); }
    .sec-mist { background: var(--mist); }
    .sec-head { max-width: 720px; margin-bottom: 36px; }
    .sec-head h2 {
      font-family: var(--serif); font-size: clamp(28px, 3.2vw, 40px);
      line-height: 1.25; letter-spacing: -.03em; color: var(--ink); font-weight: 600;
    }
    .sec-head p { margin-top: .75em; color: var(--muted); }
    .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
    .split img { width: 100%; height: 520px; object-fit: cover; }
    .spec-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); margin-top: 28px; border: 1px solid var(--line); }
    .spec-row div { background: var(--plaster); padding: 14px 12px; }
    .spec-row b { display: block; font-family: var(--serif); font-size: 20px; color: var(--ink); }
    .spec-row span { font-size: 12px; color: var(--muted); }
    .scene-grid {
      display: grid; grid-template-columns: 1.4fr 1fr 1fr; grid-template-rows: auto auto; gap: 14px;
    }
    .scene-main { grid-row: 1 / span 2; position: relative; min-height: 520px; overflow: hidden; }
    .scene-main img, .scene-item img { width: 100%; height: 100%; object-fit: cover; }
    .scene-main figcaption, .scene-item {
      position: relative; overflow: hidden; min-height: 250px; border: 1px solid var(--line);
    }
    .scene-copy, .scene-item figcaption {
      position: absolute; left: 0; right: 0; bottom: 0;
      padding: 18px; background: linear-gradient(transparent, rgba(18,19,20,.78)); color: #fff;
    }
    .scene-item h3, .scene-copy h3 { font-size: 18px; font-weight: 600; }
    .scene-item p, .scene-copy p { font-size: 13px; color: #E8E2D8; }
    .adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .adv-card {
      border: 1px solid var(--line); background: #fff; padding: 24px 22px;
      transition: transform .25s ease, border-color .25s ease;
    }
    .adv-card:hover { transform: translateY(-3px); }
    .adv-card h3 {
      font-size: 18px; color: var(--ink); margin-bottom: 10px;
      background-image: linear-gradient(var(--amber), var(--amber));
      background-repeat: no-repeat; background-position: left bottom; background-size: 0 1px;
      transition: background-size .28s ease; padding-bottom: 8px;
    }
    .adv-card:hover h3 { background-size: 42% 1px; }
    .adv-card p { color: var(--muted); font-size: 15px; }
    .metric-bar {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
      border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
    }
    .metric { padding: 36px 20px; text-align: left; }
    .metric + .metric { border-left: 1px solid var(--line); }
    .metric b { font-family: var(--serif); font-size: 42px; color: var(--ink); letter-spacing: -.04em; display: block; line-height: 1; }
    .metric span { display: block; margin-top: 10px; font-size: 13px; color: var(--muted); }
    .models { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .model {
      border: 1px solid var(--line); background: #fff; display: flex; flex-direction: column;
      transition: transform .25s ease;
    }
    .model:hover { transform: translateY(-3px); }
    .model img { height: 220px; object-fit: cover; width: 100%; }
    .model-body { padding: 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
    .badge { display: inline-flex; width: fit-content; font-size: 11px; letter-spacing: .12em; color: var(--moss); border: 1px solid var(--moss); padding: 2px 8px; }
    .model h3 { font-size: 20px; color: var(--ink); }
    .model ul li { font-size: 14px; color: var(--muted); padding-left: 12px; position: relative; }
    .model ul li::before { content: ""; width: 5px; height: 1px; background: var(--amber); position: absolute; left: 0; top: .85em; }
    .axis { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; position: relative; }
    .axis::before {
      content: ""; position: absolute; left: 8%; right: 8%; top: 22px; height: 1px; background: var(--line);
    }
    .step { padding: 0 12px 0 0; }
    .step i {
      width: 12px; height: 12px; border: 1px solid var(--amber); background: var(--plaster);
      display: block; margin-bottom: 16px; position: relative; z-index: 1;
    }
    .step h3 { font-size: 16px; margin-bottom: 8px; color: var(--ink); }
    .step p { font-size: 13px; color: var(--muted); }
    .philosophy {
      background: var(--dark); color: #F4EEE4; padding: 0;
    }
    .philo-grid { display: grid; grid-template-columns: 1.1fr .9fr; min-height: 640px; }
    .philo-copy { padding: 88px 48px; border-right: 1px solid var(--champagne); }
    .giant {
      font-family: var(--serif); font-size: clamp(56px, 8vw, 120px);
      line-height: .9; letter-spacing: -.06em; color: #E8D5BA;
    }
    .quote {
      font-family: var(--serif); font-size: clamp(22px, 2.4vw, 32px);
      line-height: 1.5; margin: 28px 0; max-width: 16em;
    }
    .philo-list { display: grid; gap: 14px; max-width: 420px; }
    .philo-list li { border-top: 1px solid var(--champagne); padding-top: 12px; font-size: 14px; color: #D9D2C6; }
    .philo-pic { position: relative; overflow: hidden; }
    .philo-pic img { width: 100%; height: 100%; object-fit: cover; min-height: 640px; }
    .case-wall {
      display: grid; grid-template-columns: 1.3fr .9fr 1fr; grid-auto-rows: 210px; gap: 12px;
    }
    .case {
      position: relative; overflow: hidden; border: 1px solid var(--line); color: #fff; display: block;
    }
    .case:nth-child(1) { grid-row: span 2; }
    .case:nth-child(4) { grid-column: span 2; }
    .case img { width: 100%; height: 100%; object-fit: cover; }
    .case span {
      position: absolute; inset: auto 0 0 0; padding: 16px;
      background: linear-gradient(transparent, rgba(18,19,20,.8));
    }
    .case b { display: block; font-size: 16px; }
    .case em { font-style: normal; font-size: 12px; color: #F3C7A8; }
    .stories { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .story { display: grid; grid-template-columns: 160px 1fr; gap: 0; border: 1px solid var(--line); background: #fff; }
    .story img { width: 100%; height: 100%; object-fit: cover; min-height: 220px; }
    .story div { padding: 22px; }
    .story h3 { font-size: 18px; margin-bottom: 8px; }
    .story p { color: var(--muted); font-size: 15px; }
    .stats {
      background: var(--ink); color: #F4EEE4; padding: 56px 0;
    }
    .stats-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .stats-grid b { font-family: var(--serif); font-size: 36px; display: block; line-height: 1; }
    .stats-grid span { font-size: 12px; color: #C9C2B6; }
    .reviews { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
    .review { border: 1px solid var(--line); background: #fff; padding: 22px; }
    .stars { color: var(--amber); letter-spacing: 2px; font-size: 12px; margin-bottom: 10px; }
    .review p { font-size: 15px; color: var(--text); min-height: 7.2em; }
    .review cite { display: block; margin-top: 16px; font-style: normal; font-size: 12px; color: var(--muted); }
    .news-list { display: grid; gap: 12px; }
    .news {
      display: grid; grid-template-columns: 220px 1fr; gap: 20px; align-items: center;
      border: 1px solid var(--line); background: #fff; padding: 12px;
      transition: transform .25s ease;
    }
    .news:hover { transform: translateY(-3px); }
    .news img { width: 100%; height: 140px; object-fit: cover; }
    .news time { font-size: 12px; color: var(--muted); }
    .news h3 { font-size: 18px; margin: 6px 0; color: var(--ink); }
    .news p { font-size: 14px; color: var(--muted); }
    .more { margin-top: 18px; display: inline-flex; }
    .partners { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; }
    .partner {
      min-height: 88px; border: 1px solid var(--line); display: grid; place-items: center;
      text-align: center; padding: 12px; font-size: 13px; color: var(--ink); background: #fff;
    }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-q {
      width: 100%; text-align: left; min-height: 56px; padding: 16px 36px 16px 0;
      font-size: 16px; color: var(--ink); position: relative;
    }
    .faq-q::after {
      content: ""; position: absolute; right: 8px; top: 26px; width: 10px; height: 10px;
      border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink);
      transform: rotate(45deg); transition: transform .25s ease;
    }
    .faq-item.is-open .faq-q::after { transform: rotate(225deg); }
    .faq-a { max-height: 0; overflow: hidden; transition: max-height .28s ease; }
    .faq-item.is-open .faq-a { max-height: 240px; }
    .faq-a p { padding: 0 0 18px; color: var(--muted); font-size: 15px; }
    .assure { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .assure div { background: var(--mist); padding: 22px; }
    .assure h3 { font-size: 16px; margin-bottom: 6px; }
    .assure p { font-size: 13px; color: var(--muted); }
    .contact { display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; }
    .contact h2 { font-family: var(--serif); font-size: clamp(28px, 3vw, 40px); }
    .contact-meta { margin-top: 22px; display: grid; gap: 10px; font-size: 15px; }
    .form { display: grid; gap: 14px; }
    label { display: grid; gap: 6px; font-size: 13px; color: var(--ink); }
    input, select, textarea {
      min-height: 44px; border: 1px solid var(--line); background: #fff; padding: 10px 12px; font-size: 15px; border-radius: var(--radius);
    }
    textarea { min-height: 110px; resize: vertical; }
    .is-error { border-color: var(--amber); }
    .err { color: var(--amber); font-size: 12px; min-height: 16px; }
    .form-ok { display: none; color: var(--moss); font-size: 14px; }
    .site-footer {
      background: var(--dark); color: #D9D2C6; padding: 56px 0 24px; font-size: 14px;
    }
    .foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
    .site-footer a:hover { color: #F3C7A8; }
    .foot-brand strong { font-family: var(--serif); font-size: 22px; color: #F4EEE4; display: block; margin-bottom: 10px; }
    .copy { border-top: 1px solid var(--champagne); margin-top: 32px; padding-top: 16px; font-size: 12px; color: #9A948A; }
    .fade { opacity: 0; transform: translateY(16px); animation: up .7s ease forwards; }
    @keyframes up { to { opacity: 1; transform: none; } }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .slide img, .fade, .adv-card, .model, .news, .faq-a, .ring .value { animation: none !important; transition: none !important; }
      .fade { opacity: 1; transform: none; }
    }
    @media (max-width: 1440px) {
      .hero h1 { font-size: 56px; }
    }
    @media (max-width: 1024px) {
      .hero-grid, .split, .philo-grid, .contact, .foot-grid { grid-template-columns: 1fr; }
      .scene-grid { grid-template-columns: 1fr 1fr; }
      .scene-main { grid-row: auto; min-height: 360px; }
      .adv-grid, .models, .reviews { grid-template-columns: 1fr 1fr; }
      .axis { grid-template-columns: 1fr 1fr 1fr; gap: 18px; }
      .axis::before { display: none; }
      .stats-grid { grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
      .partners { grid-template-columns: repeat(3, 1fr); }
      .nav-links, .nav-cta { display: none; }
      .hamburger { display: block; }
      .philo-copy { padding: 56px 24px; }
      .philo-pic img { min-height: 360px; }
      .case-wall { grid-template-columns: 1fr 1fr; grid-auto-rows: 180px; }
      .case:nth-child(4) { grid-column: auto; }
    }
    @media (max-width: 768px) {
      .tool-left span:nth-child(n+3), .tool-right a:first-child { display: none; }
      .hero { min-height: auto; }
      .hero-grid { min-height: auto; padding: 36px 0 48px; }
      .ring-wrap { grid-template-columns: 1fr; }
      .spec-row, .metric-bar, .assure { grid-template-columns: 1fr 1fr; }
      .metric + .metric { border-left: 0; border-top: 1px solid var(--line); }
      .stories, .news { grid-template-columns: 1fr; }
      .story img { min-height: 180px; }
      .reviews { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .axis { grid-template-columns: 1fr; border-left: 1px solid var(--line); margin-left: 6px; }
      .step { padding-left: 18px; }
    }
    @media (max-width: 520px) {
      .container { width: calc(100% - 28px); }
      section { padding: 64px 0; }
      .hero h1 { font-size: 34px; }
      .adv-grid, .models, .partners, .scene-grid, .case-wall, .metric-bar, .spec-row, .assure { grid-template-columns: 1fr; }
      .scene-main { min-height: 280px; }
      .split img { height: 280px; }
      .tier { grid-template-columns: 1fr; }
    }